Please include cheaper GPUs as well. Make I'm just looking for more/different video ports for my PC? The name doesn't imply any restriction for being for training. Also, using best buy as the only data source seems odd, maybe there's a way to use PCPartPicker or similar as a data source, and expand from there?
There are plenty of cheap options. You can remove default 12GB memory filter, adjust utilization, and limit price to $300.
On the data source: BestBuy just had the best least walled off APIs and prices seem lower that Amazon, so it is the first.